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1. Why can't our bodies digest the cellulose in dietary fiber? why can't our lipid digesting enzymes break down fake fat like olestra?

2. what is the role of oxygen in cellular respiration? why does cellular respiration stop if a person cannot breathe?

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Sixta Kovacek
Sixta KovacekLv2
24 Apr 2018

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Related questions

1.Aerobic cellular respiration: In the absence of oxygen – what processes stop? Why do they stop?

2. Do the reactions that are unique to fermentation itself (not the reactions of glycolysis that precede the fermentation-specific steps) provide the cell with additional useful high-energy molecules? Explain briefly. If you answered yes – how many high-energy molecules and what kind? If you answered no – then why does the cell do the fermentation step?

3. Do the cells in your body do fermentation? Explain.

4. When cells use fermentation instead of aerobic cellular respiration, is NAD+/NADH involved in this process? What happens to this molecule? Explain briefly.

5. Your body can harness energy from sources besides carbohydrates like glucose. Briefly explain how proteins and fats can be broken down and funneled into the reactions of cellular respiration.

3. Carbohydrates A. Carbohydrate digestion begins in the oral cavity. Name the enzyme that initiates carbohydrate digestion. Name the 3 sets of organs that secrete this enzyme. B. Describe how carbohydrates are chemically digested in the small intestine. Include a discussion of brush border enzymes. C. Does the pancreas release any enzymes which chemically digest carbohydrates? If yes, name it (them). How does pancreatic juice enter the small intestine? D. Fiber (AKA cellulose in plant cell walls) is not digestible. Why not? Despite not being digestible, fiber is beneficial to our health. Why?

4. Proteins A. Where are proteins first digested chemically? What enzyme initiates protein digestion? B. Does the pancreas release any enzymes that chemically digest proteins? If yes, name it (them). C. Describe 3 ways in which the body uses these protein subunits.

CELL RESPIRATION LAB

Section:

Type in your answers in complete sentences, be precise and specific to earn full credit, reformat if necessary

Purpose: The purpose of this lab activity is to analyze the effect of exercise on cellular respiration

Experiment 1 Enzymes in Food

Why is cellular respiration necessary for living organisms?

Why is fermentation less effective then respiration?

List the two co-enzymes involved in cellular respiration and describe their role.

How many ATP molecules are produced in

Glycolysis

Citric Acid Cycle

Electron Transport

Fermentation

Table 1. Fermentation by Yeast

Tube

Initial Gas (mm)

Final Gas (mm)

Net Change

1% Glucose Solution

1% Sucrose Solution

1% Equal Solution

1% Splenda Solution

1% Sugar Solution

Include your hypothesis for this experiment. Be specific…in other words we sure to include at least one end point you will measure to support your predictions. Natural sugar causes fermentation by producing CO2

Did you notice a difference in the rate of respiration between the sugars? Did any of the artificial sugars provide a good starting material for fermentation? Yes no artificial sugar did not provide a good starting material for fermentation as there was no change in height of gas.

Which tubes displayed evidence of anaerobic fermentation? How did you know? Due to change in gas height we can determine fermentation was occurring during to production of CO2

Hypothesize why some of the solutions were not metabolized. Research their chemical formulas.

How do the results of this experiment related to the role yeast play in baking?

Experiment 2Aerobic Respiration in Beans

How did the color of the bromothymol blue solution in each beaker change over time in each condition?

What is the mechanism driving the bromothymol blue solution color change?

What can be inferred from the color change of the bromothymol blue solution?

What evidence do you have that cellular respiration occurred in the beans? Explain your answer.

What are the controls in this experiment, and what variables do they eliminate?

If this experiment were conducted at 0 °C, what difference would you see in the rate of respiration? Why?

Table 2: Bromothymol Blue Color Change Over Time for Pinto Bean Trial

Time

Pre-Soaked Pinto Beans

Dry Pinto Beans

No Pinto Beans

0 min

30 min

60 min

90 min

120 min

150 min

180 min

24 hours

Table 3: Bromothymol Blue Color Change Over Time for Kidney Bean Trial

Time

Pre-Soaked Kidney Beans

Dry Kidney Beans

No Kidney Beans

0 min

30 min

60 min

90 min

120 min

150 min

180 min

24 hours

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